CN213144642U - Plunger type fuel injection pump - Google Patents
Plunger type fuel injection pump Download PDFInfo
- Publication number
- CN213144642U CN213144642U CN202021991790.1U CN202021991790U CN213144642U CN 213144642 U CN213144642 U CN 213144642U CN 202021991790 U CN202021991790 U CN 202021991790U CN 213144642 U CN213144642 U CN 213144642U
- Authority
- CN
- China
- Prior art keywords
- plunger
- tappet
- cam
- pump body
- cavity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model provides a plunger type injection pump, it is including: the pump body, plunger and barrel assembly, tappet subassembly and cam. The pump body is internally provided with an accommodating cavity extending along the vertical direction, the lower part of the pump body is provided with a cam shaft inner cavity, and the cam shaft inner cavity is communicated with the accommodating cavity. The plunger and barrel assembly is located in the containing cavity and comprises a plunger sleeve and a plunger, the plunger sleeve is tightly attached to the inner wall of the containing cavity, the plunger is connected to the plunger sleeve in a vertically sliding mode, and the gap between the plunger sleeve and the plunger is 2.0-3.0 microns. The tappet subassembly is connected in the bottom of plunger, and the cam is located the camshaft inner chamber and rotationally connects in the pump body, and the tappet subassembly is pressed in the arcwall face of cam, and the cam can promote tappet subassembly, plunger up-and-down motion. The plunger sleeve is internally provided with a fuel oil cavity which is positioned at the top of the plunger and communicated with the oil hole on the pump body. Through rationally setting up the clearance between plunger bushing and the plunger, can reduce the risk that machine oil brought into in the fuel intracavity to minimum.
Description
Technical Field
The utility model relates to a plunger type injection pump.
Background
The plunger type fuel injection pump of the diesel engine is mainly used for matching with the diesel engine and is installed on a power assembly of a bus, a truck and the like taking diesel as fuel.
The diesel engine is composed of a advancer, a pump body component, an oil delivery pump, a speed regulator and other large components. The plunger matching part is arranged on the pump body of the plunger type fuel injection pump of the diesel engine, and the fuel is pressurized by the up-and-down movement of the plunger in the plunger sleeve, so that the purpose of outputting the fuel is achieved. The plunger and barrel assembly can move up and down in work only by clearance fit, high-pressure fuel oil and low-pressure lubricating oil are respectively arranged at two ends of a plunger, and the movement of the plunger and barrel assembly can be ensured and the high-pressure fuel oil and the low-pressure lubricating oil can be separated only by controlling the clearance of the plunger and barrel assembly, so that the working performance of the injection pump is ensured.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a plunger type injection pump that can solve above-mentioned problem in order to overcome among the prior art defect that plunger matching parts are difficult to block the mutual seepage of high pressure fuel and low pressure lubrication machine oil.
The utility model discloses an above-mentioned technical problem is solved through following technical scheme:
a plunger-type fuel injection pump, comprising:
the pump body is internally provided with an accommodating cavity extending along the vertical direction, the lower part of the pump body is provided with a cam shaft inner cavity, and the cam shaft inner cavity is communicated with the accommodating cavity;
the plunger and barrel assembly is positioned in the accommodating cavity and comprises a plunger sleeve and a plunger, the plunger sleeve is tightly attached to the inner wall of the accommodating cavity, the plunger is connected to the plunger sleeve in a vertically sliding manner, the gap between the plunger sleeve and the plunger is 2.0-3.0 mu m, a fuel oil cavity is formed in the plunger sleeve and positioned at the top of the plunger, and the fuel oil cavity is communicated with an oil hole in the pump body;
the tappet assembly is connected to the bottom end of the plunger;
the cam is positioned in the inner cavity of the cam shaft and is rotatably connected to the pump body, the tappet assembly is pressed on the arc-shaped surface of the cam, and the cam can push the tappet assembly and the plunger to move up and down.
Preferably, the tappet assembly comprises a tappet, a lower spring seat and a tappet roller, an opening is formed below the tappet, the tappet roller is located in the tappet, the lower spring seat is located above the tappet, the plunger is connected to the lower spring seat, and the tappet roller presses on the arc surface of the cam.
Preferably, the plunger type fuel injection pump further comprises an upper spring seat and a spring, the upper spring seat is located above the lower spring seat and fixed relative to the pump body, and the spring is pressed between the upper spring seat and the lower spring seat.
Preferably, the plunger type fuel injection pump further comprises an adjusting pull rod, and the adjusting pull rod is located in the accommodating cavity.
On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.
The utility model discloses an actively advance the effect and lie in: through reasonable setting of the plunger sleeve and the clearance between the plungers, an oil film is formed between the plunger sleeve and the plungers, the plungers can move up and down in the plunger sleeve, and the risk that engine oil is brought into a fuel cavity is reduced to the minimum.
Drawings
Fig. 1 is a schematic sectional structure diagram of a plunger type fuel injection pump according to a preferred embodiment of the present invention.
Description of reference numerals:
The accommodating chamber 110
Camshaft bore 120
Plunger and barrel assembly 200
Plunger 220
Tappet roller 330
Cam 400
Adjusting drawbar 700
Detailed Description
The present invention will be more clearly and completely described below with reference to the accompanying drawings.
Fig. 1 shows a plunger-type injection pump, which comprises: pump body 100, plunger and barrel assembly 200, tappet assembly 300 and cam 400. The pump body 100 has a receiving cavity 110 extending in a vertical direction therein, and the lower portion of the pump body 100 has a cam shaft inner cavity 120, and the cam shaft inner cavity 120 is communicated with the receiving cavity 110. The plunger and barrel assembly 200 is located in the accommodating cavity 110, the plunger and barrel assembly 200 comprises a plunger sleeve 210 and a plunger 220, the plunger sleeve 210 is tightly attached to the inner wall of the accommodating cavity 110, the plunger 220 is connected to the plunger sleeve 210 in a vertically sliding manner, and the gap between the plunger sleeve 210 and the plunger 220 is 2.0-3.0 μm. The tappet assembly 300 is connected to the bottom end of the plunger 220, the cam 400 is positioned in the cam shaft inner cavity 120 and is rotatably connected to the pump body 100, and the tappet assembly 300 presses the arc-shaped surface of the cam 400. The cam 400 can push the tappet assembly 300 and the plunger 220 to move up and down. The plunger sleeve 210 has a fuel chamber 211 therein, the fuel chamber 211 is located at the top of the plunger 220, and the fuel chamber 211 communicates with an oil hole (not shown) in the pump body 100.
In order to allow the cam 400 to move smoothly within the camshaft interior 120, the camshaft interior 120 is filled with lubricating oil. As the plunger 220 moves up and down within the plunger sleeve 210, there is a risk that oil will seep into the high-pressure fuel along with the up-and-down movement of the plunger 220, affecting the combustion characteristics of the fuel. In this scheme, through the clearance between reasonable setting plunger bushing 210 and the plunger 220 for form the oil film between plunger bushing 210 and the plunger 220, separation camshaft inner chamber 120 and fuel oil chamber 211 both guarantee that plunger 220 can be in plunger bushing 210 up-and-down motion, reduce to the minimum with the risk that machine oil brought into fuel oil chamber 211 again.
In the embodiment, the tappet assembly 300 includes a tappet 310, a lower spring seat 320 and a tappet roller 330, wherein an opening 311 is formed below the tappet 310, the tappet roller 330 is located in the tappet 310, the lower spring seat 320 is fixed above the tappet 310, the plunger 220 is connected to the lower spring seat 320, and the tappet roller 330 presses on the arc surface of the cam 400. The plunger type fuel injection pump further comprises an upper spring 600 seat 500 and a spring 600, wherein the upper spring 600 seat 500 is positioned above the lower spring seat 320 and fixed relative to the pump body 100, and the spring 600 is pressed between the upper spring 600 seat 500 and the lower spring seat 320. The tappet roller 330 is engaged with the arc surface of the cam 400, so that the cam 400 rotates to push the tappet roller 330, the tappet 310, the lower spring seat 320 and the plunger 220 to move up and down. Meanwhile, the tappet roller 330 rotates in the up-and-down movement process, so that the frictional resistance between the tappet roller and the tappet roller is reduced, and the tappet roller is prevented from being stuck in the movement process. The spring 600 can make the tappet roller 330 always press on the cam 400, so that the plunger 220 can be automatically reset after completing the upward movement.
In addition, the plunger type fuel injection pump further comprises an adjusting pull rod 700, and the adjusting pull rod 700 is located in the accommodating cavity 110. The adjusting lever 700 is used to adjust the amount of fuel supplied to the fuel injection pump.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.
Claims (4)
1. A plunger-type fuel injection pump, comprising:
the pump body is internally provided with an accommodating cavity extending along the vertical direction, the lower part of the pump body is provided with a cam shaft inner cavity, and the cam shaft inner cavity is communicated with the accommodating cavity;
the plunger and barrel assembly is positioned in the accommodating cavity and comprises a plunger sleeve and a plunger, the plunger sleeve is tightly attached to the inner wall of the accommodating cavity, the plunger is connected to the plunger sleeve in a vertically sliding manner, the gap between the plunger sleeve and the plunger is 2.0-3.0 mu m, a fuel oil cavity is formed in the plunger sleeve and positioned at the top of the plunger, and the fuel oil cavity is communicated with an oil hole in the pump body;
the tappet assembly is connected to the bottom end of the plunger;
the cam is positioned in the inner cavity of the cam shaft and is rotatably connected to the pump body, the tappet assembly is pressed on the arc-shaped surface of the cam, and the cam can push the tappet assembly and the plunger to move up and down.
2. The plunger type fuel injection pump of claim 1 wherein the tappet assembly includes a tappet having an opening thereunder, a lower spring seat positioned in the tappet, and a tappet roller positioned above the tappet, the plunger being attached to the lower spring seat, the tappet roller pressing against the circular arc surface of the cam.
3. The plunger-type fuel injection pump of claim 2 further comprising an upper spring seat positioned above the lower spring seat and fixed relative to the pump body, and a spring compressed between the upper spring seat and the lower spring seat.
4. The plunger-type fuel injection pump of claim 3 further comprising an adjustment tie located within the receiving cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021991790.1U CN213144642U (en) | 2020-09-11 | 2020-09-11 | Plunger type fuel injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021991790.1U CN213144642U (en) | 2020-09-11 | 2020-09-11 | Plunger type fuel injection pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213144642U true CN213144642U (en) | 2021-05-07 |
Family
ID=75711092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021991790.1U Active CN213144642U (en) | 2020-09-11 | 2020-09-11 | Plunger type fuel injection pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213144642U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115234418A (en) * | 2022-06-17 | 2022-10-25 | 中国民航大学 | Horizontal opposed two-stroke aero-engine oil pump driving mechanism for burning negative carbon fuel |
-
2020
- 2020-09-11 CN CN202021991790.1U patent/CN213144642U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115234418A (en) * | 2022-06-17 | 2022-10-25 | 中国民航大学 | Horizontal opposed two-stroke aero-engine oil pump driving mechanism for burning negative carbon fuel |
| CN115234418B (en) * | 2022-06-17 | 2023-09-26 | 中国民航大学 | Oil pump driving mechanism of horizontally opposed two-stroke aeroengine for burning negative carbon fuel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE19522306B4 (en) | High-pressure fuel supply pump | |
| CN213144642U (en) | Plunger type fuel injection pump | |
| US6439204B1 (en) | Timing advance piston for unit pump or unit injector and method thereof | |
| EP0913574A2 (en) | Fuel injector solenoid utilizing an apertured armature | |
| EP1098087B1 (en) | Fuel Injector | |
| JP2003269296A (en) | Oil feeder for high pressure fuel pump | |
| CN1112370A (en) | Fuel injection device for internal combustion engines | |
| CN108533430A (en) | A kind of diesel engine super-pressure vehicle fuel pump structure | |
| DE102004056665A1 (en) | Method, computer program and control and / or regulating device for operating an internal combustion engine, and internal combustion engine | |
| EP1423599A1 (en) | Fuel injection device for an internal combustion engine | |
| DE3409295C2 (en) | ||
| DE102013225418A1 (en) | Method for operating a high-pressure fuel pump of a fuel injection device of an internal combustion engine | |
| US5992767A (en) | Injector | |
| CN213144640U (en) | Anti-leakage plunger type fuel injection pump | |
| CN208564826U (en) | A kind of high pressure distribution rotor | |
| JP3612633B2 (en) | Lubrication structure of unit injector | |
| KR920004513B1 (en) | Fuel injection pump | |
| CN213144641U (en) | Inline injection pump for suppressing oil entry | |
| JPH0441244Y2 (en) | ||
| WO2008065013A1 (en) | Internal combustion engine | |
| JPS6196170A (en) | Selector valve device | |
| JPS62223454A (en) | Fuel injection nozzle for diesel engine | |
| JPS6014933Y2 (en) | fuel injection valve | |
| JPS5822990Y2 (en) | Distribution type fuel injection pump for internal combustion engines | |
| JPS62210257A (en) | Injection pressure control unit of fuel injection pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |